vic46 wrote:
the_armadillo wrote:
Can also be related to height. Bridges (overpasses) are often slightly bowed upward in the center for loading and drainage. As such greater clearance underneath is often in the left (centermost) lanes.
Would the posted height not be the lowest point of the overhead structure?
Not necessarily. The posted height is the height of the span over the normal lanes of traffic. If the traffic is temporarily moved to one side of the span it may not be as high as over the normal lanes. Thus the warning for large vehicles to move to the lane with height that can accommodate them.
